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A note that after replacing my water pump, the fluctuating rpm problem suddenly got solve. Fluctuating rpm due to temperature?

Hi Everyone! I've been following most of the threads here tho i've never posted as yet. Am driving a Silver Optra. Reg - Nov 03. Great car to drive so far....till now.... would like to check with all the Optra drivers out there. I've experienced an intermittent problem of fluctuating fuel gauge since getting the car, once in Feb, May & in the last 2 days. Called up SA this morning & found out from their guy that apparently this was a problem reported by a few other Optras. In Feb when I brought this to their attention, they had no idea what was happening. Now they tell me its happening to other drivers too. They're now waiting for response from Chevy HQ. BTW, they changed my fuel pump 2 weeks ago after I reported my 2nd fluctuation. However this did not solve the problem. Anyone else facing the same issue?

Hi Bro, Any Aveo drivers has encountered such problems (Fluctuating fuel guage). My problem is: I only use up 25 litres of oil for 184km but the guage shows below 1/4 tank left. Pls help !!! Me?????

I'm driving a 10 month old 323. Recently noticed that my RPM kept on fluctuating when I'm stationary (stopping at traffic lights). But it's not always happening....but it seems pretty obvious recently. Although RPM is fluctuating from 500rpm to 700rpm, sometimes I can feel as if the car is almost "dying", then suddenly, it'll rev higher to compensate for it..... Mileage wise, I've clocked about 24K liao. Done 4 times of oil change liao. Recently changed to Shell Helix Ultra (stock was Shell Helix Super). Engine noise was noticeably quieter during cold start after this synthetic oil change. But I've yet to change any spark plugs or air filter. I'm thinking of resolving this problem myself first before approaching MM. Coz if not.....if they find out it's a small problem (ie wear and tear stuff), they'll charge me exorbitant fees to replace them coz it's not under warranty for wear and tear parts. Any suggestion? Anyone having this problem also? Think, in the meantime, I'll try to change the spark plugs and air filter. Hopefully it'll help.